Pressure generator for regulating devices



'JL M. BARRETT PRESSURE GENERATOR FOR REGULATING DEVICES Dgc. '28 1926.

Filed Feb. 27. 1922 Patented Dec. 28, 1926.

UNITED STATES 1,611,987 PATENT OFFICE.

JOSEPH M. BARRETT, OF FOSTORI A, OHIO, ASIGNOR TO THE so REGULATOR MANUFACTURING COMPANY, OF FOSTORIA, OHIO, A CORPORATION OF OHIO.

rnEssuRE enmana'roa roa nneuna'rme nnvrcns.

' Application filed February 27, 1922. Serial No. 539,789.

This invention relates to a device for producing a variable fluid pressure dependent upon temperature conditions within a container to which the device is connected. For instance this pressure generator may be connected withthe water and steam space of a container and produce a variable pressure according to the water level. such variable pressure may be used for various purposes, as regulating water feed, giving an alarm, closing valves, etc. This invention is concerned with the construction of the generator independently of the particular use thereof.

One of the uses for my generator is con trolling of the feeding of water to a steam boiler, wherein the diiference in temperature between the water and steam in the boiler is used for actuating the control mechanism. Such a regulator system is shown and described in Patent No. 1,193,125, issued August .1, 1916, to N. G. Copley, wherein the pressure within the generator chamber actuates a diaphragm which in turn actuates the valve controlling the feed water.

One of the objects of this invention is the provision of a device which may be satisfactorily employed for various controlling operations and which may be cheaply constructed and readily assembled so as to be 51115018111313! sensitive to respond quickly to temperature changes.

My invention also contemplates the provision of a device which may be used as a generator in the manner referred to in the above patent but is so constructed that the material of which the generator is formed is not required to withstand boiler pressure. In this connection, my invention is directed toward a construction for eliminating the use of intricate castings.

In carrying out the above objects, I provide a generator wherein apipe of standard material may be connected at two points to a fluid container, and wherein the generator proper comprises a pressure chamber formed of two castings .with a tubular member extending therebetween and entirely surrounding the ipe. The castings are adapted to be rigid y secured to the pipe so as to provide a pressure chamber uneommunicatingly surrounding the pipe, which pressure chamber may be connected through a pressure conduit to a diaphragm-operated valve. In addition, I provide. heat radiating vanes 'have shown a enerator indicated which are separate integral units, and are well adapted for producing variations in heat-radlatlng capacity, in that the number of vanes associated with each generator may features of my invention; Figs. 2 and 3 are sectional views on an enlarged scale and showing the method of securing the heads to thecasing; Fig. 4 is an elevation showing a suitable connection of the generator to the water column of the boiler; and Fig. 5 is a front elevation of one of the radiating vanes removed from the generator.

In Fig. 4, I have shown a diagrammatic installation embodying inclined conduits 10 and 11 which are connected to. a water column 12 above and below respectively, of the normal water level in the boiler and I haveshown an oppositely inclined conduit 13 which may be swivelled-at 14 and 15 to the conduits 10 and 11 respectively. This conduit 13 is preferably a single length of pipe, the middle of which is approximately on a horizontal plane with the normal water level in the boiler. Surrounding the pi e 13, I s a unit at 16 and provided with a pressure conduit 17 which is adapted to be connected to the diaphragm operated valve (not shown).

The construction of the generator as embodied in this. invention comprises two heads 20 and 21'which may be rigidly secured, as

by brazing, to the pipe 13, and which are adapted to be connected together so as to form an enclosed chamber by the casing 22. The upper head 20 may be threaded to receive a plug 23, while the lower head 21 may be provided with an extension piece 24 which is externally threaded to receive the conduit 17.

Each of the heads is preferably a cupshaped casting having portions thereof reduced-in diameter and externally threaded. as at 30 and 31 respectively. The shoulder formed by the reduced portion with the body of each head comprises an annular inwardly extending V-shaped recess, as at 32, and 33,

respectively into which recesses the ends of the casin are ada ted to extend. The lower head 21 -1S provi ed with a loop as at 35 which may constitute an expansion loop so as to prevent the variations in pressure within the generator from moving the heads 1ongitudinally of the pipe 13.

The casing 22 may be constructed of a single length of light tubular metal having the ends internally threaded, to engage the threaded portions 30 and 31, and having the extreme ends beveled to enterthe recesses 32 and 33 respectively. The angle at which the ends of the casing is beveled withreference to the axis of the generator is sli htly larger than the angle at which the portions 32 and 33 are recessed. I have found that highly satisfactory results may be obtained by mak- :ing this difference in angularity approximately 2. In this way, the ends of the easing may be wedged into the heads whereby a pressure tight joint is more readily secured.

In Figs. 1 to 3, the external diameter of the casing is shown as forming a continuation of the cylindrical ortions of the respective heads. This enab es the heat radiating vanes to be slipped over the head 20 and to r be moved longitudinally of the casing to any desired extent.

Each heat radiating unit comprises an annular radial vane 40 havin a laterally extending hub flange 41 whic is adapted to closely embrace the exterior of the casing and to be held in frictional engagement 5 therewith. These units may then be positioned as close together as the sensitiveness of the generator requires; it being of course obvious that the greater the number of vanes, the more readily will be the capacity for conducting heat from the generator.. In this way, the individual units may be formed separately from the casing and the heads, so that any defect in any one casting W111 not require the loss of the entire generator.

By constructin the generator after the manner describe itwill be seen that the necessity for constructing the casing and heads of material sufiiclent ';to withstand boiler pressure is obviated. Thus, the difiiculty of securing a casting sufiicien-t to withthreaded to engage the heads. Furthermore the heat radiating vanesare easily adapted for engagement with the tubing and for variations'in spacing if such be desired for purposes of securing greater conductivity at one point, than is secured at another.

Since ressure within the generator need be suflicient only to actuate a diaphragm against the force of a spring, it follows that the strength of the parts of the casing is independent of the pressure within the con tainer to which the central tube is connected, and accordingly such casing parts may be quite light and still suflicient for enabling the generator to operate in conjunction with any suitable pressure fluid container. This is advantageous in that a multiplicity of pat-- terns for generators operating on different external pressures is replaced by a single pattern for the heads. The various sizes may then. be obtained by merely varying the length of the casing to secure different capaclty.

Having thus described my invention, I claim A device of the character described having in combination a length of pipe, a pair 0t cup-shaped heads closely embracing the pipe and facmg each other each of said heads having an externally threaded reduced portion, a cylindrical .cas'in internally threaded at the ends thereof an adapted to engage the threaded portion of the heads, an annular flange at the base of said external threads, said annular flange being cut to provide an annular longitudinally opening V-shaped recess and a com lementary V-s aged edge at the end of sai cylinder adapte to fit into said recess, the angle of said V-sha ed head being slightly greater than the ang e of said V-shaped recess.

In testimony whereof, I hereunto affix my signature.

J. M. BARRETT. 

